<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="css/my.css">
</head>
<body>
    <h1>哈哈哈哈</h1>
    <h2>哈哈哈</h2>
    <h3 class="c1">哈哈哈</h3>
    <h4>哈哈</h4>
    <h5 class="c1">哈</h5>
    <p id="p1">啊啊</p>
<div id="p2">
    <p>好好</p>
</div>
</body>
</html>